Ultraviolet photodissociation of 1-bromopropane at 234 and 267nm

Zha, Song; Wang, Yanmei; Tang, Bifeng; Zheng, Qiusha; Zhang, Bing

doi:10.1016/j.cplett.2005.07.056

Cited by 18 publications

(8 citation statements)

References 23 publications

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“…The photodissociation dynamics of the alkyl bromides at the level of the A dissociative state has been a subject of recent, extensive experimental work, mainly through resonance-enhanced multiphoton ionization (REMPI) studies for different laser wavelengths. − The dissociation of the C−Br bond is a fast process, taking place within a few hundreds of femtoseconds, and for the case of CH 3 Br the dissociation time was estimated to be 120 fs …”

Section: Resultsmentioning

confidence: 99%

Comparative Study of Multielectron Ionization of Alkyl Halides Induced by Picosecond Laser Irradiation

Kaziannis

Kosmidis

2007

J. Phys. Chem. A

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The interaction of C2H5X, 1-C3H7X, 1-C4H9X, where X = I, Br, Cl, with strong (1 x 10(13)-1.2 x 10(14) W/cm2) 35 ps laser pulses at 1064 nm is studied by means of time-of-flight mass spectrometry. The multielectron ionization following the C-X bond elongation has been verified for the studied molecules. By combination of the intensity dependence of the ion yields, the estimated kinetic energies of the released fragment ions, and their angular distributions, we have identified the different dissociation channels of the transient multiply charged parent ions. From the dependence on the laser intensity of the ratio of the doubly charged halogen ions to the singly charged ones, it is concluded that the molecular coupling with the laser field increases with the molecular size.

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Section: Resultsmentioning

confidence: 99%

Comparative Study of Multielectron Ionization of Alkyl Halides Induced by Picosecond Laser Irradiation

Kaziannis

Kosmidis

2007

J. Phys. Chem. A

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“…The imaging experimental setup has been described in detail elsewhere. 20 Briefly, it consists of a home-built TOF mass spectrometer and a two-dimensional (2D) position sensitive detector. The TOF mass spectrometer is a differentially pumped vacuum chamber coupled with an electrostatic immersion lens.…”

Section: Methodsmentioning

confidence: 99%

“…The imaging experimental setup has been described in detail elsewhere . Briefly, it consists of a home-built TOF mass spectrometer and a two-dimensional (2D) position sensitive detector.…”

Section: Methodsmentioning

confidence: 99%

Velocity Map Imaging of Dissociative Ionization and Coulomb Explosion of CH₃I Induced by a Femtosecond Laser

et al. 2008

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The dissociative ionization and the Coulomb explosion of CH3I irradiated by a 35 fs 800 nm laser with a laser intensity of 4 x 10(13) to 6 x 10(14) W/cm2 was studied. In a relatively weak laser field (about 10(13) W/cm2), the dissociative ionization of CH3I took place. The speed distributions of the CH3+ and I+ fragments were measured and fitted using multiple Gaussian functions. Different product channels were found for CH3+ and I+, respectively. In a strong laser field (about 10(14) W/cm2), the multiply ionized fragment ions of Iq+ (q

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“…This path carries a parallel character to result in a positive β of Br photofragment, because of the large absorption cross section to 3 Q 0 surface. 8,9,18−20 The Br speed distribution at 233.6 nm is broader than that of Br* at 231.9 nm (see similar effect for structural isomers 21,22 and for smaller bromo-alkanes 5,20,23 ). Such results are indicative for the nature of dissociative excited states of C−Br bond, thus suggesting that the Br atoms are fragmented slowly on the potential energy surface.…”

Section: Resultsmentioning

confidence: 99%

“…In contrast, the Br photofragment obtained at 233.6 nm yields an intermediate β, which results from the perpendicular transition to 3 Q 1 in combination with a non-adiabatic transition from 3 Q 0 to 1 Q 1 surface. This path carries a parallel character to result in a positive β of Br photofragment, because of the large absorption cross section to 3 Q 0 surface. ,,− The Br speed distribution at 233.6 nm is broader than that of Br* at 231.9 nm (see similar effect for structural isomers , and for smaller bromo-alkanes ,, ). Such results are indicative for the nature of dissociative excited states of C–Br bond, thus suggesting that the Br atoms are fragmented slowly on the potential energy surface.…”

Section: Resultsmentioning

confidence: 99%

Stereodynamic Imaging of Bromine Atomic Photofragments Eliminated from 1-Bromo-2-methylbutane Oriented via Hexapole State Selector

et al. 2019

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Both single-laser and two-laser experiments were conducted to look into the ion-imaging of Br*( 2 P1/2) and Br( 2 P3/2) photo-fragmented from 1-bromo-2-methylbutane in the range 232-240 nm via a detection scheme of (2+1) resonance-enhanced multiphoton ionization. The angular analysis of these photofragment distributions yields the anisotropy parameter β = 1.88 ± 0.06 for the Br* excited state which arises from a parallel transition, while β = 0.63 ± 0.09 for the Br ground state indicates the contribution from both a perpendicular transition and a non-adiabatic transition. When a hexapole coupled with an orienting field was implemented, the parent molecules are spatially oriented to yield an orientation efficiency || of 0.15. Besides the χ angle between the recoil velocity v and the transition dipole moment μ, orienting molecules allows for the evaluation of the angle α between v and the permanent molecular dipole moment d. The angular analysis of Br * photofragment distribution yields χ to be 11.5° and α in the range from 160° to 180° with weak dependency. In the two-laser experiments, the angular anisotropy of Br photofragment distribution was found to be smaller (0.38 ± 0.10) when the photolysis wavelength was red-shifted to 240 nm, suggesting the increasing contributions from perpendicular transitions.

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Ultraviolet photodissociation of 1-bromopropane at 234 and 267nm

Cited by 18 publications

References 23 publications

Comparative Study of Multielectron Ionization of Alkyl Halides Induced by Picosecond Laser Irradiation

Comparative Study of Multielectron Ionization of Alkyl Halides Induced by Picosecond Laser Irradiation

Velocity Map Imaging of Dissociative Ionization and Coulomb Explosion of CH₃I Induced by a Femtosecond Laser

Stereodynamic Imaging of Bromine Atomic Photofragments Eliminated from 1-Bromo-2-methylbutane Oriented via Hexapole State Selector

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Ultraviolet photodissociation of 1-bromopropane at 234 and 267nm

Cited by 18 publications

References 23 publications

Comparative Study of Multielectron Ionization of Alkyl Halides Induced by Picosecond Laser Irradiation

Comparative Study of Multielectron Ionization of Alkyl Halides Induced by Picosecond Laser Irradiation

Velocity Map Imaging of Dissociative Ionization and Coulomb Explosion of CH3I Induced by a Femtosecond Laser

Stereodynamic Imaging of Bromine Atomic Photofragments Eliminated from 1-Bromo-2-methylbutane Oriented via Hexapole State Selector

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Velocity Map Imaging of Dissociative Ionization and Coulomb Explosion of CH₃I Induced by a Femtosecond Laser